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Section through the embryo. (Epiblast visible but not labeled.)
Cell differentiation
Carnegie stage 3
Days 8
Precursor inner cell mass
Gives rise to ectoderm, mesoderm
Dorlands/Elsevier e_11/12336502

In embryology, the epiblast is a class of cells present during gastrulation. At this stage, the epiblast and hypoblast together form the bilaminar disk of the developing embryo. Both layers are derived from the inner cell mass.

Some sources state that only epiblast cells give rise to the three germ layers of the embryo,[1], some state that it gives rise to ectoderm and mesoderm,[2], while others state that it gives rise to ectoderm only.[3]

In mammalian embryogenesis, the columnar cells of the epiblast are adjacent to the trophoblast, while the cuboidal cells of the hypoblast are closer to the Blastocoele.

See also


  1. "The trilaminar germ disk (3rd week)". Retrieved 2007-08-12.
  2. Epiblast at eMedicine Dictionary
  3. "Dorlands Medical Dictionary". Retrieved 2007-08-12.

External links